JP3422747B2 - Scroll fluid machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine for compressing, expanding, and pumping a fluid, and more particularly, an outermost peripheral wrap of a fixed scroll or an orbiting scroll having a larger diameter is formed in an annular shape. The present invention relates to a scroll fluid machine having an outermost wall of a surrounding body that takes in and compresses a fluid with the outermost wrap.

[0002]

2. Description of the Related Art Conventionally, scroll fluid machines having a fixed scroll and an orbiting scroll are well known. The technique disclosed in JP-A-7-208353 is one of them. In this technique, as shown in FIG. 12, a space 108 and a wrap 100 are formed in a fixed scroll 106, an annular groove 122 is formed in a contact surface 121, and an elastic body 127 and a seal member 123 are formed in the annular groove 122. The seal member 123 receives the mirror surface of the orbiting scroll 107, and the orbiting scroll 107 orbits.

[0003]

According to the above technique, the contact surface 121 has the void 108, the lap 100, and the annular groove 1.
Forming 22 leaves an abutment surface 121B that is not originally required for fluid uptake and compression. Therefore, the mirror surface of the orbiting scroll 107 requires a large diameter beyond the contact surface 121B. Further, the contact surface 121A of the fixed scroll 106 only needs to be able to form the annular groove 122, and it is originally not necessary to be wider than that, leaving an appropriately narrow edge.

Therefore, according to this conventional technique, in the fixed scroll and the orbiting scroll, the parts which are not originally required remain without being reduced, and the raw materials of the fixed scroll and the orbiting scroll are excessively used and a large driving force is required. Therefore, it becomes a bottleneck in downsizing.

On the other hand, in the scroll compressor, it is necessary to increase the number of turns of the scroll wrap in order to obtain a high compression ratio and a high pressure ratio. Further, in the scroll vacuum pump, it takes time to vacuum the container. It is necessary to increase the suction volume of gas in order to shorten the rotation speed, and therefore it is necessary to increase the orbiting radius of the orbiting scroll. In order to satisfy these requirements, it is necessary to increase the main body size of the scroll fluid machine.

However, in order to satisfy these requirements by using the above-mentioned conventional technique, it is necessary to enlarge the void 108, and accordingly the annular groove 122 has a large diameter,
The seal member 123 becomes longer, and the frictional force of the seal member increases. Further, in the compression process of the fluid, leakage of the compressed fluid from the high compression chamber side to the low compression chamber side of the compression chamber formed by the orbiting scroll wrap and the fixed scroll wrap is prevented, and a high compression ratio and a high pressure ratio are obtained. For this purpose, it is necessary to dispose a seal member between the upper surface of the wrap and the sliding surface of the opposite side, but the frictional force of this seal member also increases due to an increase in the size of the main body of the scroll fluid machine.

In view of the above problems, it is an object of the present invention to provide a scroll fluid machine which can be downsized. Another object of the present invention is to provide a scroll fluid machine capable of obtaining a high compression ratio and a high pressure ratio without increasing the main body size of the scroll fluid machine. Another object of the present invention is to provide a scroll fluid machine capable of suppressing an increase in load even when achieving a high compression ratio. Another object of the present invention is to provide a scroll fluid machine capable of reducing the usage of both scroll members, seal members and the like.

[0008]

[Means for Solving the Problems] The first aspect of the present invention is the center side.
The scroll rack is formed in a spiral shape from the outer side to the outer side.
With orbiting scroll and fixed scroll
In the scroll fluid machine, the one scroll side
The wrap is the scroll wrap and the scroll wrap.
From the outer peripheral side end of the cup to the center side for a predetermined length from the outer peripheral side end.
The other scroll is provided on the peripheral surface side opposite to the extending first outer wall.
The second outer wall is formed by sandwiching the sliding bottom on which the
And an outermost wrap to be formed, and the end side of the outermost wrap
Is connected to the peripheral wall of the first outer wall of the scroll wrap
It is characterized by being

According to the first aspect of the present invention, a scroll on one side of the fixed scroll or the orbiting scroll is provided with a spiral wrap formed in a spiral shape from the center side toward the outer peripheral side,
Since the outermost peripheral wrap having a diameter larger than the outer peripheral end of the wrap of the scroll on the other side is provided and the outermost peripheral wrap is the outermost wall of the scroll on the one side, the outermost wall has an extra edge width as in the prior art. And the scroll wrap on the other side is combined so that the scroll wrap on the other side is arranged inside the scroll wrap on the one side, a scroll mechanism is provided. Is downsized, and the scroll fluid machine is downsized. Therefore, the members constituting the scroll mechanism are reduced in weight, the load on the scroll mechanism is reduced, and the power for driving the scroll mechanism can be reduced. Further, even with the same size and shape, a high compression ratio and a high pressure ratio can be achieved.

The second aspect of the present invention is a scroll fluid machine having a fixed scroll and an orbiting scroll, wherein a seal member is interposed between the scroll sliding surface and the counter sliding surface to keep the inside airtight. A groove that is formed on each of the scroll wrap and the second outer wall on the one scroll side on the top surface of the wrap that is in contact with the fixed scroll bottom surface, and that has grooves formed along the wrap extension direction, and that contacts the mating scroll sliding bottom surface. A dynamic surface seal member is provided, and side surfaces of the seal member made of a dust seal fitted in the outermost peripheral wrap and the seal member made of a tip seal fitted in the scroll wrap at the connecting position of the first outer wall and the second outer wall. There face capable constructed, the cushion sealant Chippushi Le was fitted to scroll wrap is interposed, the outermost wraps The elastic member is inserted into Sutoshiru bottom, in the articulated position, the cushion sealing material, characterized in that adjacent to or in contact with the dust seal side.

According to the second aspect of the invention, since the seal member is interposed between the scroll sliding surface and the mating sliding surface of the fixed scroll and the orbiting scroll to keep the inside airtight, the scroll wrap and the fixed scroll wrap are The leakage of the compressed fluid from the high compression chamber side to the low compression chamber side of the compression chamber formed by is suppressed, and a high compression ratio and a high pressure ratio can be achieved.

Further, since the sliding surface sealing member of the outermost peripheral wrap, which comes into contact with the mating sliding surface, is disposed on the outermost peripheral wrap, the sliding surface sealing member of the outermost peripheral wrap maintains an internal airtightness. At the same time, it is possible to perform the role of a dust seal without providing a dust seal outside the outermost wrap. Therefore, the members constituting the scroll mechanism are reduced in weight, the load on the scroll mechanism is reduced,
The power for driving the scroll mechanism can be reduced. Further, even with the same size and shape, a high compression ratio and a high pressure ratio can be achieved.

Further, since the outermost peripheral wrap acts as the outermost wall, it is necessary to use a dust seal excellent in wear resistance as the sliding surface sealing member, but it is not necessary to use a chip seal excellent in high temperature and high pressure. May be.

An outer peripheral end of the spiral wrap of the scroll on the one side and the outermost peripheral wrap form a communication portion communicating from the middle of the outermost lap, and the scroll on the one side is formed. It is also possible to dispose a chip seal on the lap from the center side to the communicating portion, dispose a dust seal on the outermost wrap, and configure the dust seal as a sliding surface sealing member of the outermost wrap. This is an effective means, and by such a technical means, the sliding surface sealing member needs to use a dust seal excellent in wear resistance, but it is not necessary to use a chip seal excellent in high temperature and high pressure property.

Further, a first outer wall having an outer peripheral side end of the spiral wrap of the one side scroll and a starting end directed toward the center side for a predetermined length from the outer peripheral side end, and a periphery from the outer peripheral end. Forming a fluid intake chamber that extends in the direction to take in a fluid from the outside, forms the outermost wall with the second outer wall communicating with the starting end portion, and forms the outermost wall from the center side in the wrap of the scroll on the one side. Place the tip seal up to the outer edge,
It is also an effective means of the present invention to dispose a dust seal on the second outer wall and configure the dust seal and the chip seal as a sliding surface sealing member of the outermost peripheral wrap.

According to the above technical means, a dust seal having excellent wear resistance is provided on the second outer wall side forming the fluid intake chamber for taking in a fluid from the outside, and a high temperature is provided on the first outer wall side having a higher temperature than the second outer wall side. Since the high-pressure-resistant tip seal can be selectively used, it does not become an excessive quality, is economical, and contributes to industrial development. Also, since the spiral wrap covers up to the first outer wall, the same tip seal is used for the first outer wall, which simplifies the assembly process.

Further, an endless groove is formed along the direction of extension of the outermost peripheral lap penetrating the connecting position of the first outer wall and the second outer wall, and the groove is floated from the upper surface of the wrap to allow the other side scroll slide. An endless seal member that comes into contact with the bottom surface is provided,
It is also an effective means of the present invention that it is adjacent to or in contact with the outer peripheral end of the tip seal fitted in the groove portion of the scroll lap located inside of the endless seal member at an intermediate position on the inner peripheral side.

According to such a technical means, since the same chip seal is arranged on the spiral wrap and the outermost peripheral wrap, the groove processing of the chip seal groove is also carried out in the dust seal groove on the outermost wall side and the chip on the spiral wrap side. It does not need to be performed separately from the seal groove, and is simplified.

Further, it is an effective means of the second invention that the thickness of the tip seal in the depth direction of the tip seal groove is configured such that the center side of the scroll is larger than the outer peripheral side. According to such a technical means, the thermal expansion of the tip seal is large on the center side where the temperature is high, the contact pressure to the tip seal increases, and the wear amount increases. Therefore, the durability can be improved by increasing the thickness dimension. it can.

In the tip seal, a tip wall sealing member having an elastic force is provided between the tip seal groove formed in the scroll wrap and a groove wall surface standing on the outer peripheral side, and the tip seal is provided in the tip seal groove. It is also an effective means of the present invention to configure the arrangement.

According to the above technical means, the internal pressure of the closed space formed by the outer peripheral side of the tip seal groove, that is, the outer peripheral side wrap of the adjacent wraps is lower than the internal pressure formed by the adjacent inner peripheral side wraps. If a gap is created between the groove wall surface and the chip seal surface, the compressed fluid leaks to the low pressure side. By interposing a groove wall surface sealing member between the groove wall surface standing on the outer peripheral side which is the low pressure side and the chip seal surface, a gap is formed between the groove wall surface on the high pressure side, the chip seal surface and the chip seal bottom surface and the groove bottom surface. If the groove occurs, leakage is prevented by the groove wall surface sealing member.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc., of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples unless otherwise specified. Not too much.

FIG. 1 is a plan view showing a schematic structure of an orbiting scroll according to an embodiment of the present invention, and FIG.
D-D and D′-D ′ cross-sectional views of FIG. 3, FIG. 3 is a configuration diagram of one tip seal arranged in the tip seal groove, and FIG. 4 is a configuration diagram showing a combination relationship between the orbiting scroll wrap and the fixed scroll wrap. 5, FIG. 5 is an explanatory view for explaining a compression process by an orbiting scroll and a fixed scroll, FIG. 6 is an explanatory view for explaining a compression process by an orbiting scroll and a fixed scroll, and FIG. 7 is another embodiment of the present invention. FIG. 8 is a plan view showing a schematic configuration of a related orbiting scroll, FIG. 8 is another configuration diagram showing a combination relationship of the orbiting scroll wrap and the fixed scroll wrap, and FIG. 9 is a configuration of another tip seal arranged in the tip seal groove. FIG. 10 is a cross-sectional view of the scroll fluid machine, and FIG. 11 is a plan view of the scroll fluid machine.

FIG. 10 is a sectional view of the scroll fluid machine. As shown in the figure, the scroll fluid machine 1 is arranged so as to be rotatable in a fixed scroll 11, a fixed scroll housing 13 attached to the lower part thereof, and a drive shaft 3 of a motor (not shown) in its internal space. The fixed scroll 11, the housing 13, and the orbiting scroll 12 are made of a metal member such as aluminum.

The fixed scroll 11 is formed in a pentagonal shape as shown in the plan view of FIG. 11, and a land portion 11 having a discharge port 16 for discharging a compressed fluid described later is formed in the central portion.
b is arranged, and 1 from the discharge port 16 in the left-right direction.
Land portions 11j and 11k in which fluid suction ports 11e and 11f are opened are arranged respectively, and three land portions 11m are arranged at positions equidistant from the discharge port 16 in the circumferential direction,
A pin crank mechanism 10, which is a rotation preventing mechanism of a revolving scroll described later, is arranged inside thereof. And
Cooling fins 23 are arranged between the land portions and between the land portion and the outer periphery. The hole 11n is a screw hole for fixing the fixed scroll 11 and the fixed scroll housing 13.

In FIG. 10, an opening 11g is opened in the land 11m, and the outer rings of the bearings 8 and 9 are fitted into the opening 11g, and the bearing 8 is formed.
Crank pins 22 are rotatably fitted and arranged in the inner races of 9 and 9 by being planted in the crank plate 17. The crank pin 22 eliminates vertical play of the bearing by means of a screw 38 on the upper surface of the bearing 9 via a pressing plate 20.

A discharge hole 11d communicating with a discharge port 16 (FIG. 11) for discharging a compressed fluid is formed at the center of the sliding surface 11c of the fixed scroll 11, and the sliding surface 11c has
Fixed scroll wrap 11 close to the discharge hole 11d
a is planted. A tip seal 34 having a self-lubricating property is provided at the tip of the lap 11a so as to form a closed space by slidingly contacting the sliding surface of the opposite side. The tip seal 34 is made of, for example, a fluorine resin such as polytetrafluoroethylene (PTFE), which has excellent wear resistance and slidability.
It can be formed of an elastic resin material such as polyether sulfane (PES), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), liquid crystal polymer (LCP), and polyesphone (PSF).

The sliding surface 11c has a suction port 11e,
11f is opened. Further, a large number of cooling fins 23 (FIG. 11) are provided on the outer bottom surface 11i of the fixed scroll 11.
Has been planted.

A fixed scroll housing 13 having the same planar outer shape as the fixed scroll 11 is screwed to the lower portion of the fixed scroll 11. A space 13b is provided in the fixed scroll housing 13,
An opening 13f is formed in the void 13b so that outside air can flow freely. Further, a motor housing 15 in which a motor (not shown) having the drive shaft 3 is arranged is arranged below the space 13b so as to be continuous therewith.

Cavity 13 of fixed scroll housing 13
An orbiting scroll 12 in which an orbiting scroll wrap 12a having a flat surface facing the wall surface of the fixed scroll wrap 11a is erected in b is provided with a drive shaft 4 and a bearing 5 which are eccentric from the drive shaft 3 of the motor. It is connected so that it can be turned. Further, a plurality of cooling fins 12f are radially arranged from the outer periphery of the bearing receiving portion 12d on the side surface 12e opposite to the sliding bottom surface 12c of the orbiting scroll 12. The orbiting scroll can be cooled by the outside air flowing from the opening 13f of the housing 13.

A tip seal 34 having a self-lubricating property is formed at the tip of the orbiting scroll wrap 12a so as to form a closed space by sliding contact with the mating sliding surface, and the tip of the outermost wrap 12b is self-lubricating. A dust seal 36 having lubricity is arranged.

The orbiting scroll 12 has three opening holes 12
g is opened corresponding to the opening hole 11g formed in the land portion 11m of the fixed scroll 11, and the opening hole 12g is formed.
Bearings 6 and 7 are fitted in the bearings, a crank pin 21 is inserted in the inner ring of these bearings, and the crank pin 22 is inserted into the crank plate 17 in the bearing.
Are eccentrically planted, and the crank pin 21 is configured to be swingable in the radial direction.

The crank pin 21 prevents the bearing 6 and the crank pin 21 from being separated from each other by means of a screw 37 on the lower surface of the bearing 6 through a pressing plate 19, and the crank pin 21 and the bearing 6 are relatively opposed to each other. The target position can be adjusted and regulated, so that the play between the bearing and the crank plate is eliminated and the vertical play is eliminated.

Next, the operation of the scroll fluid machine according to this embodiment having the above structure will be described. In FIG. 10, when the motor rotates and the orbiting scroll 12 starts the orbiting motion, the fluid taken in from the tips of the wraps 11a and 12a is caused by the crescent-shaped closed space of the wraps formed by the wraps 12a and 11a, respectively. It is compressed and discharged to the discharge port 16 from the discharge hole 11d opened in the central portion.

In the process, the high heat generated by being compressed by the closed space is cooled by the cooling fins 12f provided on the back surface of the orbiting scroll 12 rotating and disturbing the air flowing in from the openings 13f. In addition, the cooling fins 23 of the fixed scroll 11 (see FIG.
The high heat is cooled by 1).

Next, the tip seal and dust seal arranged in the groove of the orbiting scroll wrap will be described.
FIG. 1 is a plan view showing a schematic configuration of an orbiting scroll according to an embodiment of the present invention. In the figure, the orbiting scroll 12A is formed in a pan shape having a sliding bottom surface 12c, and a wrap 12a is formed in a spiral shape from one inner surface of the outer walls 12b, 12b 'forming the pan shape toward the center. .

Outside the outer walls 12b, 12b ', three crank pin insertion portions 12i, 12 are provided at positions corresponding to the land portion 11m of the fixed scroll 11 at intervals of 120 ° in the circumferential direction.
j, 12k are provided. On the upper surface 42 of the outer wall 12b, 12b ', the end portion 18 on the crank pin insertion portion 12j side is formed.
The end 18 on the side from 12k to 12i passing through d to 12b '
The dust seal groove 18 extending to d'is formed, and the wrap 12a extending from the outer wall 12b toward the center side reaches the end 43d 'on the crank pin insertion portion 12i side from the end 43d on the center side and a part of the outer wall 12b. A chip seal groove 43 is formed.

As shown in the sectional view CC, a dust seal 36 having self-lubricating property and abrasion resistance, and an elastic member 39 made of a rubber material for pressing the dust seal 36 from the bottom surface 18b are inserted into the dust seal groove 18. To be done. The tip seal groove 43 has a depth dimension L1 on the outer peripheral side and a depth dimension L3 on the center side as shown in the AA sectional view and the BB sectional view.
In such a case, L1 <L3 is formed such that the depth gradually increases from the outer peripheral side toward the center side, and therefore the thickness of the tip seal is the outer peripheral side dimension L2 <the central side dimension L4. Is formed as.

On the other hand, the dust seal 36 and the tip seal 3
4 is in contact with the section D-D and D'- in FIG.
As shown in the D ′ cross-sectional view, the bottom surfaces 43b and 18b of each groove have the same depth (b) but different (a)
You may stay. Further, naturally, the groove bottom surface 43 of the chip seal 34
The depth of b may be deeper than the groove bottom surface 18b of the dust seal.

Here, the shape of the tip seal will be described in more detail with reference to FIG. In this figure, the upper surface 4 facing the opposite mirror surface 11c of the orbiting scroll wrap 12a.
A groove 43 is cut along the extending direction of the groove 2, and the chip seal 34 described above is arranged in the groove 43.

As shown in FIG. 3 (b), the tip seal 34 has a slit 34c on the side facing the bottom surface 43b of the groove 43 toward the high pressure side in the upper right direction in FIG. 3 (a). Projecting pieces 44 having an elastic pressing force are formed at predetermined intervals on the bottom surface 43b side, which are formed by cutting so as to open. Then, in the present embodiment, the groove 4 is taken into consideration in consideration of the assemblability.
The width of the tip seal 34 is formed to be shorter than the width of 3, and a groove 41 is cut in one surface 34d of the tip seal 34 along the extending direction thereof. Silicon rubber, fluorine, nitrile, etc. are formed in the groove 41. The cushion (seal member) 40 formed of the elastic resin material is fitted, and in that state, the tip seal 34 is fitted in the groove 43 of the wrap 12a.

In the tip seal 34, the upper surface 34a comes into contact with the opposite mirror surface to form a hermetically sealed space due to the back pressure of the ejection fluid in the ejection hole 11d shown in FIG. 10 which presses the lower surface 34c of the tip seal 34. However, if the back pressure is low, it becomes difficult to form a closed space. However, the elastic force of the protruding piece 44 causes the tip seal 34 to float and the upper surface 34a to come into contact with the mirror surface of the opposite side, thereby ensuring the formation of the closed space and preventing the discharge fluid from leaking.

The high pressure side surface 3 of the tip seal 34
When a fluid pressure higher than that of the low pressure side surface 34d is applied to 4b, the wall surface 43a (FIG. 1) of the tip seal groove 43 and the tip seal side surface 34b are separated from each other to form a gap. Since it is sealed, it does not leak to the lap side next to the low pressure side, and the fluid that has flowed into the bottom surface 43b side of the chip seal groove is leaked to the low pressure side wrap winding end side by the bottom surface protruding piece 44. To be prevented.

Although the structure shown in FIG. 3 has been described for the orbiting scroll, the same tip seal is used as the tip seal arranged in the lap groove of the fixed scroll. Then, by combining the fixed scroll and the orbiting scroll, the plane configuration shown in FIG. 4 can be obtained. In the figure, the wrap 11a of the fixed scroll 11 is arranged between the wrap 12a of the orbiting scroll 12 and the outer wall 12b '.

In this state, the fixed scroll wrap 11a
Since the intake space 45 between the and the outer wall 12b 'of the orbiting scroll 12 has a negative pressure, the fluid sucked from the intake ports 11e and 11f of the fixed scroll is taken into the intake space 45, and the fluid of the orbiting scroll 12 is rotated. By the swinging, the liquid is discharged from the discharge port 11d of the fixed scroll. Next, this operation process will be described with reference to FIGS.

In FIG. 5 (a), the fluid in the space S1 communicating with the intake space 45 is transferred to the closed space S2 (b) formed by the orbiting scroll wrap 12a and the fixed scroll wrap 11a as the orbiting scroll 12 swings. It is captured. The closed space is S3 (Fig. 6 (a)) →
S4 (Fig. 6 (b)) → S5 (Fig. 5 (a)) → S6 (Fig. 5
(B)) → S7 (FIG. 6 (a)) and compressed due to the formation of a closed space having a smaller volume than the closed space in the preceding stage, and the final compression chamber S8 is formed as shown in (FIG. 6 (b)). It is discharged to the outside by communicating with the discharge port 11d.

Further, in FIG. 5 (a), the fluid in the space T1 communicating with the intake space 45 is the orbiting scroll 1
The closed space T2 formed by the orbiting scroll wrap 12a and the fixed scroll wrap 11a by the swinging of T2.
Captured in (b). And the closed space is T3 (Fig.
(A)) → T4 (FIG. 6 (b)) → T5 (FIG. 5 (a)) →
T6 (FIG. 5 (b)) → T7 (FIG. 6 (a)) is compressed by forming a sealed space having a smaller volume than the sealed space in the preceding stage, and finally compressed as shown in (FIG. 6 (b)). The compression chamber T8 is discharged to the outside by communicating with the discharge port 11d.

In the present embodiment, for convenience of explanation, the outer walls 12b and 12b 'of the orbiting scroll and the wrap 12 are provided.
Although the description has been made by distinguishing from a, the outer walls 12b and 12b '
The inner wall surface of the fixed scroll wrap 11a and the wrap wall surface of the fixed scroll wrap 11a face each other and are in contact with each other.
Reference numerals b and 12b 'serve as outermost wraps of the orbiting scroll.

Further, in FIG. 1, the tip seal groove 43 formed in the wrap 12a may extend from the groove end portion 18d 'to the outer wall 12b' and extend to the end portion 18d. In that case, the tip seal 34 can also serve as a dust seal in the outermost wrap.

Next, the schematic structure of the orbiting scroll according to another embodiment of the present invention will be described with reference to FIG.
The difference from FIG. 1 is that a part of the tip seal also serves as a dust seal in FIG. 1, but does not also serve as a dust seal in FIG. 7. The same members as those in FIG. 1 are denoted by the same reference numerals.
In FIG. 7, the orbiting scroll 12B has a sliding bottom surface 12
An outer wall 1 formed in a pot shape having c and forming the pot shape
A wrap 12a is formed in a spiral shape from one inner surface of 2b and 12b 'toward the center.

Outside the outer walls 12b, 12b ', three crank pin insertion portions 12i, 12 are provided at positions corresponding to the lands 11m of the fixed scroll 11 at intervals of 120 ° in the circumferential direction.
j, 12k are provided. A dust seal groove 18 is formed on the upper surface 42 of the outer wall 12b, 12b ', as shown in the FF cross-sectional view, and the lap 12a extending from the outer wall 12b, 12b' toward the center is EE, G-. As shown in the G sectional view, a tip seal groove 43 is formed from the end portion 43d on the center side to the end portion 43d 'on the crank pin insertion portion 12j side.

As shown in the FF sectional view, a dust seal 36 having self-lubricity and wear resistance and an elastic member 39 made of a rubber material for pressing the dust seal 36 from the bottom surface 18b are inserted into the dust seal groove 18. To be done. The tip seal groove 43 has a depth dimension L1 on the outer peripheral side and a depth dimension L3 on the center side as shown in the EE sectional view and the GG sectional view.
In such a case, L1 <L3 is formed such that the depth gradually increases from the outer peripheral side toward the center side, and therefore the thickness of the tip seal is the outer peripheral side dimension L2 <the central side dimension L4. Is formed as.

On the other hand, the dust seal 36 and the chip seal 3
As shown in the D "-D" cross-sectional view of FIG. 2, the portions adjacent to each other with the contact or the permissible voids have the same depth (b) on the bottom surfaces 43b and 18b of the respective grooves. Or they may be different (a). The groove bottom surface 43b of the chip seal 34 may of course be deeper than the groove bottom surface 18b of the dust seal.

The shape of the tip seal is the same as that described in detail in FIG. The dust seal 34 is also made of the same material as in FIG. The dust seal 34 may have a seamless annular shape, but one or several pieces having an appropriate length may be inserted and arranged in the groove 18.

When the fixed scroll and the orbiting scroll are combined, the plane structure shown in FIG. 8 can be obtained. In the figure, the wrap 11 of the fixed scroll 11
a is the wrap 12a of the orbiting scroll 12 and the outer wall 12
b, 12b '.

In this state, the fixed scroll wrap 11a
Since the intake space 45 between the and the outer wall 12b 'of the orbiting scroll 12 has a negative pressure, the fluid sucked from the intake ports 11e and 11f of the fixed scroll is taken into the intake space 45, and the fluid of the orbiting scroll 12 is rotated. By the swinging, the liquid is discharged from the discharge port 11d of the fixed scroll. This operation process is the same as the operation of the orbiting scroll of FIG. 1 described with reference to FIGS. 5 and 6, and the description thereof will be omitted.

In the other embodiments, the outer walls 12b and 12b 'of the orbiting scroll and the wrap 12a are distinguished from each other for convenience of description, but the outer walls 12b and 12b are different from each other.
The inner wall surface of b'and the wrap wall surface of the fixed scroll wrap 11a face each other and can come into contact with each other.
Reference numerals 2b and 12b 'serve as outermost wraps of the orbiting scroll.

Further, in FIG. 7, the tip seal groove 43 formed in the wrap 12a may be formed by extending from the groove end portion 43d 'to the outer wall 12b. In that case, the tip seal 34 can also serve as a dust seal in the outermost wrap.

FIG. 9 is a structural view of another tip seal arranged in the tip seal groove. In the figure, (a) shows a cylindrical seal member 46A having a solid circular shape whose one cross section is formed of an elastic member is used for the chip seal 34 to be inserted into the chip seal groove 43, and (b). Uses a cylindrical seal member 46B having a hollow circular shape whose cross section is formed into a cylindrical shape.

Further, in FIG. 9C, a chip seal 27 having a quadrangular cross section is used in place of the chip seal 34 having the seal member 46, and the bottom surface 4 of the groove 43 is used.
A bottom surface 43 formed by cutting the 27A surface on the side facing the 3b so that the cut opening is opened toward the high pressure side 50.
Protrusions 28 having an elastic pressing force on the b side are arranged at predetermined intervals, and similarly, the lap walls of adjacent lap walls formed by cutting so as to open the notch toward the high pressure side 50 are formed. Projection piece 2 having elastic pressing force on the high pressure side surface 27c
9 are arranged at predetermined intervals.

In the tip seal 27, the back surface pressure of the compressed fluid pressing the bottom surface 27A of the tip seal 27 causes the top surface 27B to come into contact with the opposite mirror surface to form a hermetically sealed space. However, when the back surface pressure is low, the tip seal is sealed. It becomes difficult to form a space. However, the elastic force of the protruding piece 28 causes the tip seal 27 to float, and the upper surface 27B abuts on the mirror surface of the other side, so that the formation of the sealed space can be ensured and the leakage of the discharged fluid can be prevented.

Further, the high pressure side surface 27 of the tip seal 27
When the pressure of the fluid C is small, the side surface 27D of the tip seal comes into close contact with the adjacent lap wall surface due to the pressing force of the protruding piece 29, so the bottom surface 43b of the groove and the bottom surface 27A of the tip seal 27A.
The leakage of the compressed fluid to the low-pressure side through the gap between and is prevented.

In the present embodiment, in FIG. 1 and FIG. 7, the tip seal groove 43 has a depth dimension L1 on the outer peripheral side and a depth dimension L3 on the central side, so that L1 <L3. Was formed so as to gradually become deeper from the outer peripheral side toward the central side, and the thickness of the tip seal was formed so that the outer peripheral side dimension L2 <the central side dimension L4.
≦ L3 and L2 ≦ L4 may be set.

Further, the example in which the orbiting scroll is provided with the dust seal and the tip seal has been described, but the present embodiment is not limited to this. The fixed scroll is provided with the dust seal and the tip seal, and only the tip seal is provided. The orbiting scroll may be orbitally driven.

Further, in the present embodiment, three pin crank mechanisms are used as the rotation preventing mechanism of the orbiting scroll, but an Oldham ring or the like can also be used.

Further, in this embodiment, since the sealing member has different degrees of thermal expansion in the high pressure portion and the low pressure portion,
It is also possible to divide into appropriate sizes and arrange seal members having different properties in consideration of the coefficient of thermal expansion, the degree of wear, and the like.

[0067]

As described above, according to the present invention, the scroll mechanism is downsized and the scroll fluid machine is downsized. Therefore, the members constituting the scroll mechanism are reduced in weight, the load on the scroll mechanism is reduced, and the power for driving the scroll mechanism can be reduced. Further, even with the same size and shape, a high compression ratio and a high pressure ratio can be achieved.

Further, according to the second aspect of the present invention, since the seal member is interposed between the scroll sliding surface and the counterpart sliding surface of the fixed scroll and the orbiting scroll to keep the inside airtight, the scroll wrap and the fixed scroll are fixed. Leakage of the compressed fluid from the high compression chamber side to the low compression chamber side of the compression chamber formed by the wrap is suppressed, and a high compression ratio and a high pressure ratio can be achieved.

Further, since the sliding surface sealing member of the outermost peripheral wrap which comes into contact with the mating sliding surface is disposed on the outermost peripheral wrap, the sliding surface sealing member of the outermost peripheral wrap maintains an internal airtightness. At the same time, the dust seal function can be achieved without providing a dust seal further outside the outermost wrap. Therefore, the members constituting the scroll mechanism are reduced in weight, the load on the scroll mechanism is reduced, and the power for driving the scroll mechanism can be reduced. In addition, even with the same size and shape, a high compression ratio,
High pressure ratios can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of an orbiting scroll according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line D-D and D′-D ′ of FIG. 1.

FIG. 3 is a configuration diagram of one chip seal arranged in a chip seal groove.

FIG. 4 is a configuration diagram showing a combinational relationship between an orbiting scroll wrap and a fixed scroll wrap.

FIG. 5 is an explanatory diagram illustrating a compression process using an orbiting scroll and a fixed scroll.

FIG. 6 is an explanatory diagram illustrating a compression process using an orbiting scroll and a fixed scroll.

FIG. 7 is a plan view showing a schematic configuration of an orbiting scroll according to another embodiment of the present invention.

FIG. 8 is another configuration diagram showing a combination relationship between the orbiting scroll wrap and the fixed scroll wrap.

FIG. 9 is a configuration diagram of another tip seal arranged in the tip seal groove.

FIG. 10 is a cross-sectional view of a scroll fluid machine.

FIG. 11 is a plan view of a scroll fluid machine.

FIG. 12 is a configuration diagram showing a conventional scroll fluid mechanism.

[Explanation of symbols]

1 Scroll fluid machine 10 Pink rank mechanism 11 fixed scroll 12 orbiting scroll 12b, 12b 'outer wall (outermost wrap) 13 Fixed scroll housing

Front page continued (72) Inventor Toshihiro Honma 3176 Shinyoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa Anest Iwata Co., Ltd. Yokohama Works (56) Reference JP-A-55-109792 (JP, A) JP-A-11- 62858 (JP, A) JP 7-208353 (JP, A) JP 64-8382 (JP, A) Actual opening 3-77083 (JP, U) Actual opening 63-54880 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/02 311

Claims (6)

(57) [Claims] 1.A spiral shape from the center side to the outer side
Orbiting scroll with each scroll wrap made
And a scroll fluid machine odor with a fixed scroll
hand, The wrap on the one scroll side is the scroll wrap.
And the outer peripheral side end of the scroll wrap and the outer peripheral side end
From the first outer wall that extends toward the center side for a predetermined length from the peripheral surface side
In addition, the sliding bottom on which the wrap of the other scroll slides
And an outermost wrap that forms a second outer wall by sandwiching
The end side of the outermost wrap is the first outside of the scroll wrap.
Being connected to the peripheral wall of the wall Scrolls featuring
Fluid machinery. 2. An outermost peripheral wall formed by the first outer wall and the second outer wall.
The outermost wrap of the orbiting scroll.
The outermost wall is formed as a structure.
Scroll fluid machine. 3. The scroll on the orbiting scroll side
Make contact with the bottom surface of the fixed scroll of the lulap and the second outer wall.
On the upper surface of the wrap along the lap extension direction.
The surface of the lap above the lap,
A sealing member that contacts the roll sliding bottom
At the connecting position of the first outer wall and the second outer wall,
A sealing member made of a dust seal fitted in the wrap,
It consists of a tip seal fitted in the scroll wrap.
Characterized by the fact that the sides of the seal members can face each other
The scroll fluid machine according to claim 1 . 4. A tip fitted in the scroll wrap
A cushion seal material is inserted in the seal,
The elastic member is inserted in the bottom of the dust seal of the
At the contact position, the cushion seal material is adjacent to the side of the dust seal.
The scroll fluid machine according to claim 3 , wherein the scroll fluid machine is in contact with or in contact with the scroll fluid machine. 5. The outer circumference from the center side of the scroll wrap
Thickness of the chip seal extending toward the side in the groove depth direction
The size of the center of the scroll is larger than that of the outer circumference.
4. The scroll fluid machine according to claim 3, wherein: 6.A spiral shape from the center side to the outer side
Orbiting scroll with each scroll wrap made
And a scroll fluid machine odor with a fixed scroll
hand, The one scroll is a slide on which the other scroll slides.
A first and a second outer wall defining a moving bottom surface;
Forming an endless groove along the wall and the second outer wall,
The endless seal member is disposed in the section, and the endless seal member
At the middle position on the inner circumference side, scroll scroll located inside
Adjacent to the outer edge of the tip seal fitted in the groove of the
Be in contact A scroll fluid machine characterized by.